It’s a question both researchers and workplace managers have puzzled over for a long while. An oft-cited study from Princeton suggested that it does factor into having less stress and more overall satisfaction, but only to a point. The threshold wasn’t a magical six-figure salary, but rather plateaued at around $75,000 per year. Yet when the CEO of Gravity Payments attempted to buy the happiness of his employees by paying them all a salary of $70,000, the results were mixed.